Instructables

Step 6: Repairing the armature and field windings

Remove any corrosion with wet and dry sand paper, and the commutator can be sanded and the back of a box cutter knife can be used to clean out between the segments. The insulation between the segments should be under cut to work correctly. Than an oily rag is used to wipe everything to help prevent any future corrosion.
 
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